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-rw-r--r--file_io/unix/filedup.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/file_io/unix/filedup.c b/file_io/unix/filedup.c
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr_arch_file_io.h"
+#include "apr_strings.h"
+#include "apr_portable.h"
+#include "apr_thread_mutex.h"
+#include "apr_arch_inherit.h"
+
+static apr_status_t file_dup(apr_file_t **new_file,
+ apr_file_t *old_file, apr_pool_t *p,
+ int which_dup)
+{
+ int rv;
+#ifdef HAVE_DUP3
+ int flags = 0;
+#endif
+
+ if (which_dup == 2) {
+ if ((*new_file) == NULL) {
+ /* We can't dup2 unless we have a valid new_file */
+ return APR_EINVAL;
+ }
+#ifdef HAVE_DUP3
+ if (!((*new_file)->flags & (APR_FOPEN_NOCLEANUP|APR_INHERIT)))
+ flags |= O_CLOEXEC;
+ rv = dup3(old_file->filedes, (*new_file)->filedes, flags);
+#else
+ rv = dup2(old_file->filedes, (*new_file)->filedes);
+ if (!((*new_file)->flags & (APR_FOPEN_NOCLEANUP|APR_INHERIT))) {
+ int flags;
+
+ if (rv == -1)
+ return errno;
+
+ if ((flags = fcntl((*new_file)->filedes, F_GETFD)) == -1)
+ return errno;
+
+ flags |= FD_CLOEXEC;
+ if (fcntl((*new_file)->filedes, F_SETFD, flags) == -1)
+ return errno;
+
+ }
+#endif
+ } else {
+ rv = dup(old_file->filedes);
+ }
+
+ if (rv == -1)
+ return errno;
+
+ if (which_dup == 1) {
+ (*new_file) = (apr_file_t *)apr_pcalloc(p, sizeof(apr_file_t));
+ (*new_file)->pool = p;
+ (*new_file)->filedes = rv;
+ }
+
+ (*new_file)->fname = apr_pstrdup(p, old_file->fname);
+ (*new_file)->buffered = old_file->buffered;
+
+ /* If the existing socket in a dup2 is already buffered, we
+ * have an existing and valid (hopefully) mutex, so we don't
+ * want to create it again as we could leak!
+ */
+#if APR_HAS_THREADS
+ if ((*new_file)->buffered && !(*new_file)->thlock && old_file->thlock) {
+ apr_thread_mutex_create(&((*new_file)->thlock),
+ APR_THREAD_MUTEX_DEFAULT, p);
+ }
+#endif
+ /* As above, only create the buffer if we haven't already
+ * got one.
+ */
+ if ((*new_file)->buffered && !(*new_file)->buffer) {
+ (*new_file)->buffer = apr_palloc(p, old_file->bufsize);
+ (*new_file)->bufsize = old_file->bufsize;
+ }
+
+ /* this is the way dup() works */
+ (*new_file)->blocking = old_file->blocking;
+
+ /* make sure unget behavior is consistent */
+ (*new_file)->ungetchar = old_file->ungetchar;
+
+ /* apr_file_dup2() retains the original cleanup, reflecting
+ * the existing inherit and nocleanup flags. This means,
+ * that apr_file_dup2() cannot be called against an apr_file_t
+ * already closed with apr_file_close, because the expected
+ * cleanup was already killed.
+ */
+ if (which_dup == 2) {
+ return APR_SUCCESS;
+ }
+
+ /* apr_file_dup() retains all old_file flags with the exceptions
+ * of APR_INHERIT and APR_FOPEN_NOCLEANUP.
+ * The user must call apr_file_inherit_set() on the dupped
+ * apr_file_t when desired.
+ */
+ (*new_file)->flags = old_file->flags
+ & ~(APR_INHERIT | APR_FOPEN_NOCLEANUP);
+
+ apr_pool_cleanup_register((*new_file)->pool, (void *)(*new_file),
+ apr_unix_file_cleanup,
+ apr_unix_child_file_cleanup);
+#ifndef WAITIO_USES_POLL
+ /* Start out with no pollset. apr_wait_for_io_or_timeout() will
+ * initialize the pollset if needed.
+ */
+ (*new_file)->pollset = NULL;
+#endif
+ return APR_SUCCESS;
+}
+
+APR_DECLARE(apr_status_t) apr_file_dup(apr_file_t **new_file,
+ apr_file_t *old_file, apr_pool_t *p)
+{
+ return file_dup(new_file, old_file, p, 1);
+}
+
+APR_DECLARE(apr_status_t) apr_file_dup2(apr_file_t *new_file,
+ apr_file_t *old_file, apr_pool_t *p)
+{
+ return file_dup(&new_file, old_file, p, 2);
+}
+
+APR_DECLARE(apr_status_t) apr_file_setaside(apr_file_t **new_file,
+ apr_file_t *old_file,
+ apr_pool_t *p)
+{
+ *new_file = (apr_file_t *)apr_pmemdup(p, old_file, sizeof(apr_file_t));
+ (*new_file)->pool = p;
+ if (old_file->buffered) {
+ (*new_file)->buffer = apr_palloc(p, old_file->bufsize);
+ (*new_file)->bufsize = old_file->bufsize;
+ if (old_file->direction == 1) {
+ memcpy((*new_file)->buffer, old_file->buffer, old_file->bufpos);
+ }
+ else {
+ memcpy((*new_file)->buffer, old_file->buffer, old_file->dataRead);
+ }
+#if APR_HAS_THREADS
+ if (old_file->thlock) {
+ apr_thread_mutex_create(&((*new_file)->thlock),
+ APR_THREAD_MUTEX_DEFAULT, p);
+ apr_thread_mutex_destroy(old_file->thlock);
+ }
+#endif /* APR_HAS_THREADS */
+ }
+ if (old_file->fname) {
+ (*new_file)->fname = apr_pstrdup(p, old_file->fname);
+ }
+ if (!(old_file->flags & APR_FOPEN_NOCLEANUP)) {
+ apr_pool_cleanup_kill(old_file->pool, (void *)old_file,
+ apr_unix_file_cleanup);
+ apr_pool_cleanup_register(p, (void *)(*new_file),
+ apr_unix_file_cleanup,
+ ((*new_file)->flags & APR_INHERIT)
+ ? apr_pool_cleanup_null
+ : apr_unix_child_file_cleanup);
+ }
+
+ old_file->filedes = -1;
+#ifndef WAITIO_USES_POLL
+ (*new_file)->pollset = NULL;
+#endif
+ return APR_SUCCESS;
+}